Elevator tackle



ELEVATOR TACKLE Filed May 3, 1932 2 Sheets-Sheet 1 IMP 65% I Dec. 13, 1932. w, SCOTT 1,891,115

ELEVATOR TACKLE Filed May 3, 1:932 2 Sheets-Sheet 2 5 \b m \\\\\\\\\\\\\\\\U u 5 a a Q \s \\\\\\\\\\\\\\\\\\\\\\\u I 1 mwyjz O 1 Z m A0 L 5. 4 6 W U E Patented Dec. 13, 1932 A UNITED STATES PATENT OFFICE WILLIAM E. SCOTT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO REUBEN W. EI-ILING, F. NORBIS'IOW'N, PENNSYLVANIA, AND ONE-HALF TO WILLIAM T. SCOTT, OF PHILADELPHIA, PENNSYLVANIA ELEVATOR TACKLE Application filed May 3, 1932. Serial No. 609,010.

This invention relates to elevator operating mechanisms, and particularly to the lifting tackle comprising the cables that connect the car and its counterweight and which pass over or around a suitably grooved drum or drums for raising and lowering the car and weight in opposition to each other in the elevator shaft or well.

The object of the present invention is to arrange a series of cables, between an elevator car and its counterweight, in a manner to provide, in effect, a single cable passing back and forth from one to the other over a driving drum or drums, whereby the load will be distributed equally between all cables, and the driving friction between the drum and all the cables will be consequently equalized.

Another object of the invention is to connect the opposite ends of each cable to the car and counterweight respectively in such a manner that should any one cable become excessively long, or break, the remaining cables will take that portion of the load, normally taken by the one inefiective cable, in substantially equal proportions and without any appreciable dropping of the car or weight with respect to each other.

In the accompanying drawings:

Fig. 1 diagrammatically illustrates an elevator car or lift and its counterweight connected in accordance with the principles of the present invention;

Fig. 2 is a diagrammatic perspective view of the tackle shown in Fig. 1;

Fig. 3 is a detail perspective view of the car connections of the tackle;

Fig. 4 is a similar perspective view of the weight connections; and

Fig. 5 illustrates in side elevation the relative posit-ions assumed by the connection on the car, or weight, or both under abnormal conditions, such as excessive stretching or breaking of one of the cables.

In Figs. 1, 2, 3 and 4, the elevator car or lift and its counterweight are illustrated at L and W respectively. Connecting the lift L and weight W is a tackle O comprising a series of six cables, in the present instance, designated as l, 2, 3, 4, 5 and 6 respectively, which pass over a driving drum D.

One end of the cable 1, in the present instance, is fixedly secured at F to the counterpivoted, equidistantly from each of its opr posite ends, to the lift L.

One end of the cable 2 is secured to the second end of the equalizing beam E on the lift L while the opposite end of the cable 2 is se cured to one end of an equalizing beam E pivotally attached intermediate its ends to the weight l/V.

One end of the cable 4 is attached to the opposite end of the beam E while the opposite end of said cable is attached to one end of an equalizing beam E pivoted intermediate its ends to the lift L.

One end of the cable 3 is attached to the opposite end of the beam E while the second end of the cable 3 is attached to an equalizing beam E pivotally attached intermediate its ends to the weight W.

One end of the cable 5 is attached to the second end of the beam E and the opposite end of said cable is attached to one end of an equalizing beam E on the lift L.

One end of the cable 6 is attached to the second end of the beam E and the opposite end of the cable is fixedly attached at F 2 to the weight l/V.

From the above description taken with the illustration of Fig. 2, it will be clear that the six cables 1 to 6 inclusive through the equalizing beams E to E inclusive constitutes in effect one single cable O and any stretch occurring in any part thereof will be taken up in equal proportions by all other parts thereof, intermediate its opposite ends which are fixed to the weight I, in the present instance, but which, it will be understood, can be fixed to the lift L, or in cases where an odd number of cables are employed one end of the tackle formed thereby may be attached to the lift while the opposite end is attached to the weight.

In any event the arrangement giving the effect of a single cable passing back and forth between the lift and the weight over or around the driving drum or drums D causes all cables at all times to bear equal portions of the load and to engage the drum under equal frictional contact therewith, and as a result thereof unequal wearing of the cables and relative creeping of the cables on the drum is eliminated, thus the useful life of the tackle is increased materially.

Each of the beams E to E inclusive comprises a pair of laterally spaced parallel arms 10, between which is disposed one end of a pivot post 11, the opposite endofwhich is rigidly secured to the upper framework of the lift L or the counterweight WV, as the case may be. The arms 10, 10 are pivotally attached to the post 11 by a through pin or bolt 12.

In each end of. each equalizing beam between the arms 10, 10 thereof is pivotally mounted a swivel block 13 having axially aligned trunnions 1d, 14 at its opposite ends respectively which are journaled in the arms 10, 10 respectively.

On each of the opposite ends of each of the cables is secured an adjusting or take-up element 15 comprising a head 16 in which the end of the cable is permanently secured and a threaded shank 17 which passes through an opening in one of the swivel blocks 13, or in the framework of the liftL or counterweight V, as the case may be, and provided at its lower end with nuts 18, 18 between which and the part through which the shank 17 passes are filler sleeves, washers or both, as indicated at 19.

Through the mechanism just described, the cables may all be adjusted to substantially equal el'l'ective lengths at the time of their initial installation, after which any relative stretching of any of the cables willbe automatically distributed throughout the whole of the tackle C by relative pivotal actions between the equalizing beams E to E inclusive.

Should any one cable break or stretch excessively the beam or beams to which the one or opposite ends of such cable are attached will rock about its or their pivot or pivots until the swivel block 18 atone end of the beam engages flatly the side of the pivot post 11 to which the beam is pivotally attached (see Fig. 5), thus the ineffective cable automatically is relieved of all strain and the load normally carried thereby is automatically distributed through the other cables, it being noted that when any one of the swivel blocks 13 engages a pivot post 11 such action automatically provides a fixed anchorage for the end of the effective cable that is attached to the opposite end of the beam that has rocked sufliciently to permit the swivel block 13 at the one end thereof to engage the pivot post of the beam.

I claim:

1. The combination with an elevator car, a counterweight for the car, and an operating drum for the counterpoised bodies, of a plurality of cables extending respectively from the car to the weight around the drum, and a plurality of equalizing elements on the car and weight respectively and connected in single series relation with the cables for producing in eii ect a single cable tackle passing back and forth between the car and the weight with each of the opposite ends of the single tackle fixedly secured to one of the said counterpoised bodies.

2. The combination with an elevator car, a counterweight for the car, and an operating drum for the counterpoised bodies, of a plurality of cables extending respectively from the car to the weight around the drum, and a plurality of equalizing elements divided into two groups with one of said groups located on thecar and the second of said groups located on the counterweight, said equalizing elements being connected in single series relation with the cables for producing in effect a single cable tackle passing back and forth between the car and the weight with each of the opposite ends of the single tackle fixedly secured to one of the said counterpoised bodies.

3. The combination with an elevator car, a counterweight for the car, and an operating drum for the counterpoised bodies, of a plurality of cables extending respectively from the car to the weight around the drum, a plurality of equalizing elements on the car and weight respectively and connected in single series relation with the cables for producing in effect a single cable tackle passing back and forth betwen the car and the weight with each of the opposite ends of the single tackle fixedly secured to one of the said counterpoised bodies, and means for transferring the load of one of said cables proportionately to the others of said cables upon relative elongating movement of and between the opposite ends of the one said cable to a predetermined limit.

4. The combination with an elevator car, a counterweight for the car, and an operating drum for the counterpoised bodies, of a plurality of cables extending respectively from the car to the weight around the drum, a plurality of equalizing elements pivotally mounted on the car and weight respectively and connected in single series relation with the cables'for producing in effect a single cable tackle passing back and forth between the car and the weight with each of the opposite ends of the single tackle fixedly secured to one of the said counterpoised bodies, and means for limiting the pivotal movement of said equalizing elements for transferring the loadof one cable proportionately to the other cables upon elongating movement of and between the ends of the said one cable to the limit determined by said limiting means.

The combination with an elevator car, a counterweight for the car, and an operating drum for the counterpoised bodies, of a plurality of cable units extending respectively from the car to the weight around the drum, a plurality of equalizing beams divided into two groups carried by the car and weight respectively and connected at their opposite ends respectively to and in single series relation with the ends of the respective cable units to produce in effect a single cable tackle passing back and forth between the car and weight, a post pivotally supporting each equalizing beam intermediate the opposite ends thereof, and a swivel block pivotally mounted at each end of each equalizing beam for connecting the ends of the cable units to the equalizing beams and arranged to bear against one end of the post upon predetermined pivotal movement of the equalizing beam, to relieve the cable unit attached to the post-engaging end of the beam of its load upon excessive elongation of the cable unit.

6. The combination with an elevator car, a counterweight for the car, and an operating drum for the counterpoised bodies, of a plurality of cable units extending respectively from the car to the weight around the drum, a plurality of equalizing beams divided into two groups carried by the car and weight respectively and connected at their opposite ends respectively to and in single series relation with the ends of the respective cable units to produce in effect a single cable tackle passing back and forth between the car and weight, a post pivotally supporting each equalizing beam intermediate the opposite ends thereof, a swivel block pivotally mounted at each end of each equalizing beam, and a take-up device at each end of each cable comprising a threaded shank and lock nuts thereon, the shanks at the opposite sides of the single tackle being each adjustably secured in one of the counterpoised bodies, while the intermediate shanks pass through and are adjustable in the swivel blocks of the equalizing beams respectively.

WILLIAM E. SCOTT. 

